Retire xabi due to high disk utilisation rate and corrupt indices

`xabi` is the latest STH-backed indexer node that's suffering from:
 * corrupt indices, which results in volatile find response latency, and
 * high disk utilisation growth with no obvious link to ingest rate.

The node has now fully utilised its 60Ti PVC, with the index growth of
14Ti over the last couple of days alone. This behaviour was observed in
other STH-backed instances; see #826.

Remove the node, considering the index records stored by the node are
present by other healthy nodes, its corrupt indices and 100% disk
utilisation at 60Ti (that is close to the 64Ti limit for io2 volumes).

deploy/manifests/prod/us-east-2/tenant/storetheindex/indexstar/deployment.yaml

@@ -16,7 +16,6 @@ spec:
             # Use service names local to the namespace over HTTP to avoid
             # TLS handshake overhead.
             - '--backends=http://vega-indexer:3000/'
-            - '--backends=http://xabi-indexer:3000/'
             - '--backends=http://dido-indexer:3000/'
             - '--backends=http://oden-indexer:3000/'
             - '--backends=http://kepa-indexer:3000/'

deploy/manifests/prod/us-east-2/tenant/storetheindex/instances/README.md

@@ -4,7 +4,6 @@ List of individually configurable instances:
 
 | Instance | sth bit-size | IOPS per GiB | Value Codec  | Whitelist           | `STHBurstRate` | `STHSyncInterval` | Running                                                                                                                                       |
 |----------|--------------|--------------|--------------|---------------------|----------------|-------------------|-----------------------------------------------------------------------------------------------------------------------------------------------|
-| `xabi`   | 30           | 5            | `binary`     | all                 | `8388608`      | `1s`              | [a51f131e986b9ac3cbfd893e9ebc7669345a25d1](https://github.com/filecoin-project/storetheindex/commit/a51f131e986b9ac3cbfd893e9ebc7669345a25d1) |
 | `vega`   | 30           | 5            | `binary`     | `nft.storage` only  | `8388608`      | `3s`              | [1deb5ed222c428f2f64eeea43f970b05ea844225](https://github.com/filecoin-project/storetheindex/commit/a51f131e986b9ac3cbfd893e9ebc7669345a25d1) |
 | `oden`   | N/A Pebble   | 5            | N/A Pebble   | `nft.storage` only  | N/A Pebble     | N/A Pebble        | [9df396fbbc40ca634872a47acae5a6b4008cf2e1](https://github.com/filecoin-project/storetheindex/commit/078d43ca27a0a57f4a568bc67f626ded2a44ecff) |
 | `dido`   | N/A Pebble   | 5            | N/A Pebble   | all                 | N/A Pebble     | N/A Pebble        | [db83b7c9fab3615621063378fdda568c6e8ba209](https://github.com/filecoin-project/storetheindex/commit/db83b7c9fab3615621063378fdda568c6e8ba209) |

deploy/manifests/prod/us-east-2/tenant/storetheindex/instances/kustomization.yaml

@@ -6,7 +6,6 @@ namespace: storetheindex
 resources:
   - pdb.yaml
   - pod-monitor.yaml
-  - xabi # 30-bit bucket size, binary value codec, 5 IOPS per GiB 
   - vega # 30-bit bucket size, binary value codec, 5 IOPS per GiB, nft.storage only
   - oden # pebble, 5 IOPS per GiB, nft.storage only
   - dido # pebble, 5 IOPS per GiB, on us-east2a